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Observations of the Cabibbo-Suppressed decays ■→nπ+π0,nπ+π-π+and the Cabibbo-Favored decay ■→nK-π+π+

Chinese Physics C 2023年第2期 5-22页

作者：麦迪娜 M.N.Achasov P.Adlarson M.Albrecht R.Aliberti A.Amoroso 安美儒安琪白羽 O.Bakina R.Baldini Ferroli I.Balossino 班勇 V.Batozskaya D.Becker K.Begzsuren N.Berger M.Bertani D.Bettoni F.Bianchi E.Bianco J.Bloms A.Bortone I.Boyko R.A.Briere A.Brueggemann 蔡浩蔡啸 A.Calcaterra 曹国富曹宁 S.A.Cetin 常劲帆常万玲车国荣 G.Chelkov 陈琛陈超陈刚陈和生陈玛丽陈申见陈少敏 T.Chen 陈旭荣 X.T.Chen 陈元柏陈卓俊成伟帅 S.K.Choi 初晓 G.Cibinettov F.Cossio 崔佳佳代洪亮代建平 A.Dbeyssi R.E.de Boer D.Dedovich 邓子艳 A.Denig I.Denysenko M.Destefanis F.De Mori 丁勇丁逸董静董燎原董明义董翔杜书先段宗欢 P.Egorov 范玉兰方建房双世方文兴方易 R.Farinelli L.Fava69B F.Feldbauer G.Felici 封常青冯俊华 K Fischer M.Fritsch C.Fritzsch 傅成栋高涵高原宁高扬 S.Garbolino I.Garzia 葛潘婷葛振武耿聪 E.M.Gersabeck A Gilman K.Goetzen 龚丽龚文煊 W.Gradl M.Greco 谷立民顾旻皓顾运厅关春懿郭爱强郭立波郭如盼郭玉萍 A.Guskov 韩文颖郝喜庆 F.A.Harris 何凯凯何康林 F.H.Heinsius C.H.Heinz 衡月昆 C.Herold 侯国一侯颖锐侯治龙胡海明 J.F.Hu 胡涛胡誉黄光顺黄凯旋黄麟钦黄性涛黄燕萍黄震 T.Hussain N Hüsken W.Imoehl M.Irshad J.Jackson S.Jaeger S.Janchiv E.Jang J.H.Jeong 纪全姬清平季晓斌季筱璐吉钰瑶贾泽坤姜赛赛江晓山 Y.Jiang 焦健斌焦铮金山金毅荆茂强 T.Johansson N.Kalantar-Nayestanaki 康晓珅 R.Kappert M.Kavatsyuk 柯百谦 I.K.Keshk A.Khoukaz R.Kiuchi R.Kliemt L.Koch O.B.Kolcu B.Kopf M.Kuemmel M.Kuessner A.Kupsc W.Kühn J.J.Lane J.S.Lange P.Larin A.Lavania L.Lavezzi 雷祚弘 H.Leithoff M.Lellmann T.Lenz 李翠李聪李春花李澄李德民李飞李刚李慧李贺李海波李惠静 H.N.Li J.Q.Li 李静舒李井文李科 L.J Li 李龙科李蕾李明浩李培荣李素娴栗帅迎李腾李卫东李卫国李旭红李晓玲李晓宇李彦谷李振轩李紫源梁畅梁昊梁浩梁勇飞梁羽铁廖广睿廖龙洲 J.Libby A.Limphirat 林创新林德旭 T.Lin 刘北江刘成刘春秀 D.Liu 刘福虎刘芳刘峰 G.M.Liu H.Liu 刘宏邦刘怀民刘欢欢刘汇慧刘建北刘佳俊刘晶译刘凯刘魁勇刘珂刘亮刘露刘美宏刘佩莲刘倩刘树彬刘桐刘维克刘卫民刘翔刘英刘玉斌刘振安刘智青娄辛丑卢飞翔吕海江吕军光陆小玲卢宇卢云鹏 Z.H.Lu 罗成林罗民兴罗涛罗小兰吕晓睿吕翌丰马凤才马海龙马连良马明明马秋梅马润秋马瑞廷马骁妍马尧 F.E.Maas M.Maggiora S.Maldaner S.Malde Q.A.Malik A.Mangoni 冒亚军毛泽普 S.Marcello 孟召霞 J.G.Messchendorp G.Mezzadri H.Miao 闵天觉 R.E.Mitchell 莫晓虎 N.yu.Muchnoi Y.Nefedov F.Nerling I.B.Nikolaev 宁哲 S.Nisar 牛艳 S.L.Olsen 欧阳群 S.Pacetti 潘祥潘越 A.Pathak P.Patteri M.Pelizaeus 彭海平 K.Peters 平加伦平荣刚 S.Plura S.Pogodin V.Prasad 齐法制齐航漆红荣祁鸣齐天钰钱森钱文斌钱圳乔从丰秦佳佳秦丽清覃潇平秦小帅秦中华邱进发屈三强 K.H.Rashid C institute of High Energy Physics G.I.Budker institute of Nuclear Physics SB RAS (BINP) the Novosibirsk State university Uppsala university Bochum Ruhr-university Johannes Gutenberg university of Mainz university of Turin INFN Liaoning Normal university State Key Laboratory of Particle Detection and Electronics university of Science and Technology of{1. Southeast university Joint institute for Nuclear Research INFN Laboratori Nazionali di Frascati INFN Sezione di Ferrara Peking university State Key Laboratory of Nuclear Physics and Technology Peking university National Centre for Nuclear Research institute of Physics and Technology university of Muenster Carnegie Mellon university Wuhan university university of Chinese Academy of Sciences Istinye university Nankai university the Moscow institute of Physics and Technology Soochow university Nanjing university Tsinghua university institute of Modern Physics Hunan university School of Physics and Electronics Hunan university Shandong university yunnan {1. Helmholtz institute Mainz Liaoning university Jilin university Zhengzhou university Sun Yat-Sen university university of Oxford university of Ferrara university of Manchester GSI Helmholtzcentre for Heavy Ion Research GmbH Guangxi university Nanjing Normal university Shandong Normal university fudan {1. Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and institute of Modern Physics fudan {1. Henan Normal university university of Hawaii Suranaree university of Technology university Avenue 1.1 South china Normal {1. i university of the Punjab Indiana university Huangshan College university of Jinan university of Groningen Justus-Liebig-Universitaet Giessen II.Physikalisches Institut Indian institute of Technology Madras Qufu Normal university Shanxi university Guangdong Provincial Key Laboratory of Nuclear Science institute of Quantum Matter South china Normal {1. Beijing institute of Petrochemical Technology Lanzhou university Frontiers Science Center for Rare Is

Using electron-positron annihilation data samples corresponding to an integrated luminosity of 4.5 fb-1.collected by the BESⅢ detector in the energy region between 4599.53 MeV and 4698.82 MeV,we report the first observations of the Cabibbo-suppressed decays Λc+→nπ+π0,Λc+→nπ+π-π+,and the Cabibbo-favored decayΛc+→nK-π+π+with statistical significances of 7.9σ,7.8σ,and >1.σ,*** branching fractions of these decays are measured to be B（Λc+→nπ+π0）=（0.64±0.09±0.02）%,B（Λc+→nπ+π-π+）=（0.45±0.07±0.03）%,and B（Λc+→nK-π+π+）=（1.90±0.08±0.09）%,where the first uncertainties are statistical and the second are *** find that the branching fraction of the decay Λc+→nπ+π0is about one order of magnitude higher than that of Λc+→nπ+.

关键词： ∧c+ baryon Branching fraction BESⅢ detector

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Luminosities and energies of e+e- collision data taken between ■=4.61.GeV and 4.95 GeV at BESⅢ

引用

Chinese Physics C 2022年第11期46卷 70-81页

作者：麦迪娜 M.N.Achasov P.Adlarson M.Albrecht R.Aliberti A.Amoroso 安美儒安琪白旭红白羽 O.Bakina Ferroli R.Baldini I.Balossino 班勇 V.Batozskaya D.Becker K.Begzsuren N.Berger M.Bertani D.Bettoni F.Bianchi J.Bloms A.Bortone I.Boyko R.A.Briere A.Brueggemann 蔡浩蔡啸 A.Calcaterra 曹国富曹宁 S.A.Cetin 常劲帆常万玲 G.Chelkov 陈琛陈超陈刚陈和生陈玛丽陈申见陈少敏 T.Chen 陈旭荣 X.T.Chen 陈元柏陈卓俊成伟帅初晓 G.Cibinetto F.Cossio 崔佳佳代洪亮代建平 A.Dbeyssi Boer R.E.de D.Dedovich 邓子艳 A.Denig I.Denysenko M.Destefanis Mori F.De 丁勇董静董燎原董明义董翔杜书先 P.Egorov 范玉兰方建房双世方文兴方易 R.Farinelli L.Fava F.Feldbauer G.Felici 封常青冯俊华 K Fischer M.Fritsch C.Fritzsch 傅成栋高涵高原宁高扬 S.Garbolino I.Garzia 葛潘婷葛振武耿聪 E.M.Gersabeck A Gilman K.Goetzen 龚丽龚文煊 W.Gradl M.Greco 谷立民顾旻皓顾运厅关春懿郭爱强郭立波郭如盼郭玉萍 A.Guskov 韩婷婷韩文颖郝喜庆 F.A.Harris 何凯凯何康林 F.H.Heinsius C.H.Heinz 衡月昆 C.Herold M.Himmelreich 侯国一侯颖锐侯治龙胡海明 J.F.Hu 胡涛胡誉黄光顺黄凯旋黄麟钦黄麟钦黄性涛黄燕萍黄震 T.Hussain N Hüsken W.Imoehl M.Irshad J.Jackson S.Jaeger S.Janchiv 纪全姬清平季晓斌季筱璐吉钰瑶贾泽坤姜侯兵姜赛赛江晓山 Y.Jiang 焦健斌焦铮金山金毅荆茂强 T.Johansson N.Kalantar-Nayestanaki 康晓珅 R.Kappert 柯百谦 I.K.Keshk A.Khoukaz P.Kiese R.Kiuchi R.Kliemt L.Koch O.B.Kolcu B.Kopf M.Kuemmel M.Kuessner A.Kupsc W.Kühn J.J.Lane J.S.Lange P.Larin A.Lavania L.Lavezzi 雷祚弘 H.Leithoff M.Lellmann T.Lenz 李翠李聪李春花李澄李德民李飞李刚李慧李贺李海波李惠静 H.N.Li J.Q.Li 李静舒李井文李科李林健李龙科李蕾李明浩李培荣李素娴栗帅迎李腾李卫东李卫国李旭红李晓玲李晓宇梁昊梁浩梁浩梁勇飞梁羽铁廖广睿廖龙洲 J.Libby A.Limphirat 林创新林德旭 T.Lin 刘北江刘春秀 D.Liu 刘福虎刘芳刘峰 G.M.Liu H.Liu 刘宏邦刘怀民刘欢欢刘汇慧刘建北刘佳俊刘晶译刘凯刘魁勇刘珂刘亮刘露刘美宏刘佩莲刘倩刘树彬刘桐刘维克刘卫民刘翔刘英刘玉斌刘振安刘智青娄辛丑卢飞翔吕海江吕军光陆小玲卢宇卢云鹏 Z.H.Lu 罗成林罗民兴罗涛罗小兰吕晓睿吕翌丰马凤才马海龙马连良马明明马秋梅马润秋马瑞廷马骁妍马尧 F.E.Maas M.Maggiora S.Maldaner S.Malde Q.A.Malik A.Mangoni 冒亚军毛泽普 S.Marcello 孟召霞 J.G.Messchendorp G.Mezzadri H.Miao 闵天觉 R.E.Mitchell 莫晓虎 N.yu.Muchnoi Y.Nefedov F.Nerling I.B.Nikolaev 宁哲 S.Nisar 牛艳 S.L.Olsen 欧阳群 S.Pacetti 潘祥潘越 A.Pathak M.Pelizaeus 彭海平 K.Peters 平加伦平荣刚 S.Plura S.Pogodin V.Prasad 齐法制齐航漆红荣祁鸣齐天钰钱森钱文斌钱圳乔从丰秦佳佳秦丽清覃潇平秦小帅秦中华邱进发屈三强 K.H.Rashid C.F.Redmer 任旷洁 A.Rivetti V.Rodin M.Rolo 荣刚 Ch.Rosner institute of High Energy Physics G. I. Budker institute of Nuclear Physics SB RAS (BINP) the Novosibirsk State university Uppsala university Bochum Ruhr-university Johannes Gutenberg university of Mainz university of Turin INFN Liaoning Normal university State Key Laboratory of Particle Detection and Electronics university of Science and Technology of{1. university of Jinan Southeast university Joint institute for Nuclear Research INFN Laboratori Nazionali di Frascati INFN Sezione di Ferrara Peking university State Key Laboratory of Nuclear Physics and Technology Peking university National Centre for Nuclear Research institute of Physics and Technology university of Muenster Carnegie Mellon university Wuhan university university of Chinese Academy of Sciences Istinye university the Moscow institute of Physics and Technology Nankai university Soochow university Nanjing university Tsinghua university institute of Modern Physics Hunan university School of Physics and Electronics Hunan university Shandong university yunnan {1. Helmholtz institute Mainz Liaoning university Zhengzhou university university of Eastern Piedmont Sun Yat-Sen university university of Oxford university of Ferrara university of Manchester GSI Helmholtzcentre for Heavy Ion Research GmbH Guangxi university Nanjing Normal university Shandong Normal university fudan {1. Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and institute of Modern Physics fudan {1. Henan Normal university university of Hawaii Suranaree university of Technology Goethe university Frankfurt South china Normal {1. Guangdong Provincial Key Laboratory of Nuclear Science institute of Quantum Matter South china Normal {1. university of South{1. university of the Punjab Indiana university Huangshan College university of Groningen Justus-Liebig-Universitaet Giessen Ⅱ.Physikalisches Institut Indian institute of Technology Madras Qufu Normal university Shanxi Normal university Beijing institute of Petrochemical Technology Lan

From December 201. to June 2021.the BESⅢ experiment collected approximately 5.85 fb-1.f data at center-of-mass energies between 4.61.and 4.95 *** is the highest collision energy BEPCⅡ has reached to *** accumulated e+e-annihilation data samples are useful for studying charmonium（-like） states and charmed-hadron *** adopting a novel method of analyzing the production of ■ pairs in e+e-annihilation,the center-of-mass energies are measured with a precision of ～0.6 *** luminosities are measured with a precision of better than 1. by analyzing the events of large-angle Bhabha *** measurements provide important inputs to analyses based on these data samples.

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